* {
    list-style: none;
    margin: 0 auto;
}

#wrap {
    width: 560px;
    height: 300px;
    margin: 150px auto;
    position: relative;
    cursor: pointer;
    background-color: #cec7c7;
}

#pic {
    /* background-color: rgb(53, 49, 44); */
    height: 280px;
    text-align: center;
}

#pic li {
    display: none;
    position: absolute;
    top: 0;
    left: 17px;
    z-index: 1;
}

#num {
    position: absolute;
    z-index: 2;
    bottom: 20px;
    left: 190px;
}

#num li {
    float: left;
    width: 8px;
    height: 8px;
    margin: 5px;
    border-radius: 50%;
    border: 1px solid #FFFFFF;
    line-height: 20px;
    background: transparent;
    text-align: center;
}

#num li.active {
    background: #fefefe;
}

.arrow {
    z-index: 3;
    height: 40px;
    width: 30px;
    position: absolute;
    top: 45%;
    line-height: 40px;
    background: rgba(0, 0, 0, 0.3);
    text-align: center;
    display: none;
}

#wrap:hover .arrow {
    display: block;
}

.arrow:hover {
    background: rgba(0, 0, 0, 0.7);
}

#left {
    left: 0;
}

#right {
    right: 0;
}